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swsusp: use GFP_KERNEL for creating basic data structures

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Make swsusp call create_basic_memory_bitmaps() before processes are frozen, so
that GFP_KERNEL allocations can be made in it.  Additionally, ensure that the
swsusp's userland interface won't be used while either pm_suspend_disk() or
software_resume() is being executed.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rafael J. Wysocki
2007-05-06 14:50:45 -07:00
committed by Linus Torvalds
parent 1525a2ad76
commit 0709db6072
4 changed files with 38 additions and 20 deletions
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10
kernel/power/user.c
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@@ -40,21 +40,21 @@ static struct snapshot_data {
char platform_suspend;
} snapshot_state;
static atomic_t device_available = ATOMIC_INIT(1);
atomic_t snapshot_device_available = ATOMIC_INIT(1);
static int snapshot_open(struct inode *inode, struct file *filp)
{
struct snapshot_data *data;
if (!atomic_add_unless(&device_available, -1, 0))
if (!atomic_add_unless(&snapshot_device_available, -1, 0))
return -EBUSY;
if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
atomic_inc(&device_available);
atomic_inc(&snapshot_device_available);
return -ENOSYS;
}
if(create_basic_memory_bitmaps()) {
atomic_inc(&device_available);
atomic_inc(&snapshot_device_available);
return -ENOMEM;
}
nonseekable_open(inode, filp);
@@ -92,7 +92,7 @@ static int snapshot_release(struct inode *inode, struct file *filp)
enable_nonboot_cpus();
mutex_unlock(&pm_mutex);
}
atomic_inc(&device_available);
atomic_inc(&snapshot_device_available);
return 0;
}